Renovation plans include a new drive-up entry and parking at the corner of Main and Griffin streets.

You can’t hide a 72-story building.

So it’s impossible not to see all the construction going on at Dallas’ tallest skyscraper, Bank of America Plaza on Main Street.

Work crews have fenced off three sides of the office tower and are busy rebuilding the lower levels.

Contractors have removed miles of argon-filled light tubes on the outside of the 28-year-old building. The familiar green lights that outline Bank of America Plaza are being replaced with LED illumination.

Tenants in the building say the entire renovation could cost as much as $20 million.

Of course that’s just a guess. Because the owner of Bank of America Plaza — Metropolis Investment Holdings of Chicago — isn’t talking to the media about the makeover.

And the landlord has ordered that architects and contractors working on the project keep mum, too.

Usually when the owners of a big office project decide to sink millions of dollars in upgrades, they’re eager to tell the world about it.

That’s certainly been the case with other downtown Dallas office projects, including 2100 Ross, Plaza of the Americas, Lincoln Plaza (now Ross Tower) and Patriot Tower.

Bank of America Plaza’s first significant redo in almost 30 years is designed to keep businesses in the building happy.

The tower is about 80 percent leased.

But just last week, one of Bank of America Plaza’s largest and oldest tenants — law firm Jackson Walker LP — announced that it’s leaving soon for newer digs in downtown Dallas’ Arts District.

Jackson Walker’s departure is proof that Bank of America Plaza’s owner needs to remodel the building to add more amenities and update its features.